[postgis-users] Re: [postgis-devel] Proposal for supporting

[Martin Davis]

Good points, but is there the option of providing named constants in 
Postgres?

Also, what about when they add more altitude mode options (say)...?

Brian Hamlin wrote:
> hmmm well I dont object to BtFields, BitFields are the *easiest* I think
> it gives you a named constant which is just the addition of other 
> named constants
>
> eg
>   clampToGround + extrude
>
> I am not sure I follow yecarillo's choice of values though
> (apparently all values are to be above 15 to avoid the precision range)
>
> but say you choose bits 0-4 as precision
> there are 2 values each of extrude and tesselate, so 1 bit each
> then altitude mode needs 2 bits for three possible values
>
> xxxx-xxxx
> 7654-3210
>
> using bits 4-7 for the flags, and 3-0 for precision works fine
>
> in this day and age who needs bit flags, anyway..
> but properly named, they are actually an easy interface
>
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-- 
Martin Davis
Senior Technical Architect
Refractions Research, Inc.
(250) 383-3022